Lindley Hoag Hadley (June 19, 1861 – November 1, 1948) was a U.S. Representative from Washington. Born near Sylvania, Indiana, Hadley attended the common schools of his native city, Bloomingdale (Indiana) Academy, and Illinois Wesleyan University, Bloomington, Illinois.He taught school in Rockville, Indiana from 1884 to 1889. He studied law. He was admitted to the bar in 1889. He moved to the State of Washington in 1890 and settled in Whatcom (now Bellingham), where he practiced law until elected to Congress.